Hot-air furnace.



F. A. CONRAD.

HOT AIR FURNACE.

APPLICATION FILED SEPT. 9. I916.

1,256,775. Patehted Feb.19,1918.

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F. A. CONRAD.

HOT AIR FURNACE. APPucAnoN FILED SYEPT. 9. 1916.

1,256,775. 1 Patented Feb. 19,1918.

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00000000 0000 00 000 00' 0000 000000000 00000000 000 oooo ooooooooo 00000000 00 FRANK A. CONRAD, 0F MILWAUKEE, WISCONSIN.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented Fen-19, 1918.

Application filed September 9, 1916. Serial N 0. 119,168.

To all whom it may concern:

Be it known that I, FRANK A. CONRAD, a citizen of the United States, residing in Milwaukee, county of Milwaukee, and State of Wisconsin, have invented new and useful Improvements in Hot Air Furnaces, of which the following is a specification.

This invention relates to improvements in hot air furnaces for heating houses and buildings, and among the objects of the invention are the securing of a more economical and more uniform distribution of the heat into different parts of the house or building to be heated; and the utilization of a maximum amount of heat from the fuel and the loss of a minimum amount up the chimney.

A device embodying the principles of this invention is illustrated in the accompanying drawings, in which:

Figure 1 is a view showing the complete furnace partly in side elevation and partly in longitudinal vertical section.

Fig. 2 is a View showing the furnace in top plan view with parts broken away to better disclose the parts beneath.

Fig. 3 is a transverse vertical section on the line 3-3 of Fig. 1.

As shown in said drawings, the complete furnace comprises a rectangular sided shell or structure 1 which is insulated against the conduction and radiation of heat, and is divided by a vertical partition 2 within into two chambers in one of which the hot-air chamber, is mounted complete a heating device 3, such as an ordinary coal burning stove, or a cast iron furnace or heater, the particular form or construction of which comprises no part of the present invention. The stove or furnace 3 is fed through a feed door 5 in one wall of the housing 1 and the ashes may be removed through another door 6 below it. The separating partition 2 within the furnace housing 1 is also insulated against the conduction and radiation of heat, being covered by an insulating layer 8; and the partition is made somewhat less in height than the structure 1 so that the heat which is radiated from the furnace or heater 3 can pass over the top of this partition. At its upper edge, this partition is joined to a horizontal partition 9, so that there is formed below the latter and between the dividing artition 2 and the back wall of the furnace, a heating chamber separated from the hot air chamber containing the stove or furnace 3. Near the top of the partition 2 is made a large opening to which is connected the smoke outlet 11 at the top of the stove or heater 3; and from the opposite side of the opening in the partition there is continued a flue 15 which is conducted in a winding course through the heating chamber, being led in the form of a letter 8, first in a hori- Zontal direction, thence downward again horizontally, and again downward, and then again horizontally, finally being joined through an opening in the back wall 18 of the heating chamber to an outlet fine 20.

Within the heating chamber and parallel to the dividing wall 2 are walls 25, 26 and 27 dividing the heating chamber in turn into four cells or compartments, although it is evident that if desired a greater or smaller number of compartments may be employed, according to the particular requirements of the device. Within each of the cells or compartment above described there is arranged a horizontal, perforated plate, 30-33 respecti vely, and similarly in the hot air chamber containing the furnace or heater 3 is a similar perforated plate 34, these plates being spaced somewhat above the bottom of the structure 1; and in the lower part of one of the side walls are made openings through which cold air is admitted into the respective cells of the heating chamber and into the furnace chamber below the perforated plates, through which latter it may pass into the chambers above. The air which enters these openings in the side wall is conducted thereto through separate passages in a triangular chamber 40 connecting with the housing 1.

In the horizontal wall 9 over the top of each of the respective cells or compartments in the heating chamber are made circular openings to which are joined hot air discharge pipes 43, these pipes extending upward through corresponding openings in the top wall of the housing or shell 1; but the latter openings are made somewhat larger than the diameters of the respective discharge pipes 43 so as to leave annular spaces for the escape of hot air coming from the furnace or hot air chamber over the top of the partition 2. The larger openings in the top wall of the furnace shell or housing 1 are joined to large outlet pipes or conduits 45, 45, into which extend for a short distance the respective discharge pipes or tubes 43; so that in each pipe t5 the hot air from one F of the cells or compartments in theheating chamber is mingled with hot air arising from the furnace or hot air chamber and conducted to the part of the building or house desired to be heated. In each pipe 45 is arranged a damper 50 of ordinary form.

The flue 15, as shown in Fig. 3, is made of decreasing cross sectional area from its beginning to its end so as to retard the escape of the products of combustion as the latter are cooled in their passage there through and correspondingly reduced in volume. I

There is also provided a length of tube 60, controlled by a damper 61, forming a direct connection between the flue 15 and the smoke pipe 20, which may be found desirable in starting the fires.

I'cl'aim as my invention In a hot'air furnace, a structure with a heating chamber'therein of less height than the height of the structure to provide an air passage over the heating chamber and with in the structure, vertical partitions separating' the heating chamber into separate compartments, a heating device in the structure separated from the heating chamber, a

Copies of this patent may be obtained for Winding flue connected to the heating device and extendin throu 'hall of the com artments in the heating chamber, a perforated horizontal partition in the lower part of each "ompartment of the heating chamber, an air inlet opening into each compartment of the heating chamber below the perforated partition, an air inlet chamber connected to the heating chamber, partitions in the air inlet chamber dividing it into separate compartments communicating respectively with the separate compartments 1n the heating chamber, a hot air discharge pipe connecting to the hot air furnace structure over each from the passage over the heating chamber.

Inv'vitness whereof, I have hereunto subscribed my name this 6th day of September,

FRANK A. CONRAD;

five cents each, by addressing the Commissioner of Patents,

Washington, D; 0.? 

